主要部件

The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中对汽车碰撞安全性的设计理论和方法进行了归类和总结，其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等；重点介绍了碰撞有限元法的基本理论和有关算法，涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等，探讨了有限元计算中的材料模型参数获取技术，开发了相应的材料试验装置及材料模型参数反求软件，在此基础上进行了基本的碰撞仿真算例和试验对比研究；文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性，指出了设计薄壁吸能构件时需要考虑的几个主要影响因素，即焊点、壁厚、横截面和预变形等；在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究，提出了吸能转向机构和自适应安全气囊的仿真研究方法；文中最后探讨了整车碰撞性能的设计与改进方法，提出了以理想碰撞特性为目标，采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法，并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究，所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车，研究结果表明，本文所提出的设计与改进方法是适用而有效的，具有重要的工程实用意义和价值。

In this paper, the strength theory is adopted to analyze the stress of the pressure component of boiler, and the calculation method of metal fatigue and creep is adopted to estimate the life loss of the boiler. Meanwhile, the short-cut calculation method is put forward which can meet the requirement of on-line monitoring. On the basis of above, the on-line monitoring and management system of boiler life is developed.

本文采用强度理论和疲劳、蠕变寿命计算方法，分别对电站锅炉的炉外、炉内主要承压部件进行了应力分析和寿命计算，并提出满足在线监测要求的简化计算方法，在此基础上，开发了锅炉承压部件的寿命在线监测和管理系统。

At present ,the company introduced the Multi -Position NC Punch, NC shear-bending machine and other high-tech production equipment, become a South China elevator door, the door of the components , security controls,variable frequency door machine , on the threshold of the component parts, such as elevator major production base

目前，公司引进了多工位数控冲床、数控剪弯机等高科技生产设备，成为华南电梯开门构、层门组件、安全部件、变频门机上坎组件等电梯部件的主要上产基地。

Pressure each parts of machine design Mainly is to the scaleboard module, ascend plank module, small car module and sign pillar each parts of etc.

压力机各部件设计主要是对底板组件、上板组件、小车组件、立柱等各部件的尺寸设计及其装配设计。

This paper analyses emphatically the design and realization of IMS-UA, including SIP stack modification, the design of SIPUAM, the design and realization of SIPUA basic functions and so on. And combining the actual SIP signal communication flow, the register/deregister, subscribe/notify event and call/session control functions are designed and realized.

本文着重分析了AGCF实体中IMS-UA部件的网络结构，设计和实现了IMS-UA部件的主要功能，包括改进了移植的SIP协议栈、设计了SIP用户代理管理器，并结合实际的SIP信令通信流程，设计和实现了SIP用户代理功能。

We are engaged in producing and designing of communication apparatus and fitting, in precision machining, such as housing, panel, placode and crust of duplexer, filter, transport mixer, tower magnifier used in electric equipment and communication ; parts of SMT or vacuum equipment ; clamps .

主要从事生产、开发通讯器材及配件，精密机械加工，产品有：电子设备、通讯设备所使用的双工器、滤波器、传输混合器、塔式放大器等产品的腔体、面板、基板、罩壳类零部件、smt设备用部件、真空设备部件及工夹具等。

The thesis mainly discusses decompounding approach of complicate targets" RCS computation, basing on the consideration of project application. First, the electromagnetic scattering of typical objects is analyzed. Second, The RCS of the complex target is computed using the decompounding approach, after breaking the drone into active parts and passive parts reasonably, then comparing with the result of typical object"s RCS from the faceting approach. Last, statistical characteristics of the drones RCS are deduced.

本文从工程应用方面考虑，采用部件分解法来计算复杂目标的雷达散射截面，主要的研究内容如下：首先对典型目标的电磁散射特性进行分析，然后合理布局靶弹的有源部分和无源部分的结构，采用部件分解法计算靶弹RCS，并与面元法计算的典型目标RCS进行对比分析，最后给出靶弹RCS的统计特性分析。

The cracking stems was studied by means of Metallography,SEM and EDAX.It is found that there are large quantities of sulfured manganese inclusions in the sample.

国内某大型制冷设备部件制造企业每年从德国进口大量的铁素体不锈钢棒材，主要用于制造空调四通换向阀中的关键部件———封头，见图1。

And estimated highly on their quality in world market of America, Asia, Europe and like places, and as manufacturing industrial control parts firm of terminal block, micro cam, toggle switch, relay, relay-socket, lamp, panel-control switch.

&，&成浩电器部件有限公司主要生产接线盒、微型开关、凸轮开关、拨动开关、继电器以及继电器开关、模拟定时器、指示灯等接近开关及其它仪用开关。作为部件专业制造企业，在美洲、亚洲、欧洲等世界市场上很受欢迎，而且继续研究、开发新型产品。

The company mainly produces oil glib supporting mechanical components, such as the dust cover, lubricating oil into the tubing connector kits, oil spill pipe connection kits, into the tubing connector kit Valve damping tight cap Valve cap tight, tight Valve cap -- ring components, component pins, screw plug, as well as the bearings and other components for the tractor factory in Shanghai, Shanghai Diesel Engine Co., Ltd., Weichai Power Co., Ltd., Wuxi Diesel Engine Factory, Dongfeng Chaoyang Diesel Engine Co., Ltd., ASIMCO Diesel pumps and other large manufacturing enterprises glib package has won the customers for further cooperation and lay a good foundation.

公司主要生产油泵油嘴配套机械部件，如防尘盖，润滑油进油管接头套，溢油管接头套，进油管接头套，阻尼出油阀紧帽，出油阀紧帽，出油阀紧帽-密封圈组件，定位销部件，螺堵，以及轴承等部件，为上海拖拉机厂，上海柴油机股份有限公司，潍柴动力股份有限公司，无锡柴油机厂，东风朝阳柴油机有限责任有限公司，亚新科等大型柴油机油泵油嘴生产企业配套，赢得了客户的好评，并为进一步的合作打下良好的基础。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。